Balloon fabric and the like.



. unrrn' sars rare are a BENJAMIN DAWSON roimrrr, or EDINBURGH, s mimjissmmmo 'rn'n nonrfi nnrrrsn-nunnnn COMPANY LIMITED, or EDINBURGH, scornnnn,

No Drawing.

durability. The rubber used for the impermeable layer miist be of the highest quality, andit must be protected, by some covering, from the actinic rays which are very lIll38Il% in the higher regions of the atmosphere and cause rapid deterioration and oxidation It is a known fact that.

of the proofing. metals of high atomic weight such as lead possess the power of stopping radiations of short wave length, and this property 1s made use of in X-ray work and with mercury vapor lamps.

The present invention consists in the application of this principle to balloon fabrics and the like combined with the other methods of protection which have already been used for the purpose.

The proofing which we use is one composed of litharge, bismuth oxid or other heavy metallic oxid, sulfur necessary for vulcanization andrubber, and a thin layer of this is applied as a coating to the outside of the fabric.

The following example illustrates my invention:

F atria-Two plies preferably of Sea Island cotton are used, the outer ply being dyed yellow with lead chromate or a yellow die fast to light, and if considered necessary, biased to obviate tearing of the fabric.

Proofing-Between these two plies of fabric is placed the layer most important for securing gas tightnesssuch layer consisting of a mixing suitable for the purpose. On the back of the two ply fabric a light layer of a similar proofing is spread to protect the inner fabric from the action of moisture deposited by the gas on passing from warmer to colder regions. Between Specification of Letters Patent. Pat gntqgqfl NQV. 24, 1914. Application filed February 11, 1913. Serial at. 747.777.

protecting layers are placed. Next the yellow cloth is a thin layer of proofin containing litharge or other heavy oxi of a laced, thus serving percentage composition most suitable for the purpose. On the surface of this proofing fine aluminum powder is dusted. ..This serves to reflect a large proportion of the light and heat waves and thereby serves the double purpose of minimizing the risk of perishing due to actinic action and also preventing the sudden expansion of the gas in the envelop, which expansion might otherwise occur on emerging from a cloud into sunshine. The whole is firmly united together and vulcanized in any known manner, either by heat or chlorid of sulfur in the cold.

The fabric consists, therefore, of the following 7 layers :(1) Aluminium dust to reflect light and heat waves. (2) Heavy metallic oXid proofing to absorb actinic light. (3) Dyed fabricbiased if necessary further reducing actinic action. (4;) Layer of yellow proofing. (5) impermeable layer of proofing. (6) Layer of undyed fabric. (7) Layer of proofing to protect this from the injurious effects of moisture.

Claims:

1. An improvedballoon fabric or the like having, applied thereto, a light ray proofin composed of a heavy metallic oxid an rubber.

.2. An improved balloon fabric, or the like having, applied thereto, a light ray proofing composed of a'heavy metallic oxid, sulfur and rubber.

3. An improved balloon fabric, or the like, consisting of an outer ply dyed yellow, an inner ply, a gas-tight layer between the plies and a light ray proofing, on the outside of these plies containing a heavy metallic oxid.

4. An improved balloon fabric, or the like, consisting of an outer ply, an inner ply, a gas-tight layer between the plies, a gas-tight layer on the inner surface of the inner ply, a proofing containing a heavy metallic oxid on the outside of the outerply and an aluminium powder dusting on the said proofing.

5 An im roved balloon fabric or the like 1 consisting o a dyed fabric a heav metallic oxid proofing on the dyed fabric, a uminium dust on the proofing, a-layer of yellow roofing on the opposite side of the dyed abric, 

